[7.x] Refactor test entry by runner (#44679)

[jbudz]

Over the last few years we've increased the number of test runners.
Entry points by test type have become too lage of a category for unique
names, so this moves top level test scripts under yarn and replaces test
types with the runner name.

e.g. yarn test:browser -> yarn test:karma

Closes #41133

Co-authored-by: Elastic Machine elasticmachine@users.noreply.github.com

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[kibanamachine]

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• 💔 Build #27508 failed 09b1b2c

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